This is normal. The battery may appear to stop charging between 93 percent and 99 percent. The batteries used in these computers are designed to avoid short discharge/charge cycles in order to prolong the overall life of the battery.

If you think it is still running poorly while on battery power there may be an running process causing this that you may be able to fix. To determine what it might be read:

hey thanks a lot!!! it really worked!!! my mac had the same problem, but then i deleted the file n now its working fine!! i was planning to change n try buying a new battery n u saved me that cost!! thanks a lot!!

Just an observation to alleviate my concern about the possible side-effect of removing this kext file

The original explanation what this file is designed to do i.e. running a low level task to a max to cool the CPU does not make sense because when my CPU is at 40 -50 Grad C 20 min after a boot the kernel file is already hogging cycles to slow down all other apps. The kernel cycle hog does its job at any temperature it seems ......

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